Picture frame



FIG. 1 is a plan view of the front of the picture frame, showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a view of the right side as seen in FIG. 1;

FIG. 5 is a view of the left side as seen in FIG. 1; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a picture frame, as shown and described. 